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Updated: Jun 1, 2026
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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
Electronic properties of graphene nanostructures
F Molitor1, J Güttinger, C Stampfer
1Solid State Physics Laboratory, ETH Zurich, Zurich, Switzerland.
Summary
Recent advancements in graphene nanostructures are reviewed, focusing on electronic properties. Graphene constrictions exhibit a transport gap due to localized puddles, enabling quantum dot fabrication for Coulomb blockade effects.
Area of Science:
- Condensed matter physics
- Materials science
- Nanotechnology
Background:
- Graphene's unique two-dimensional (2D) electronic transport properties.
- The fundamental structure of graphene and its electronic behavior.
Purpose of the Study:
- To review recent developments in fabricating graphene nanostructures.
- To discuss the understanding of electronic properties in graphene nanostructures.
- To highlight the role of graphene constrictions and quantum dots.
Main Methods:
- Overview of graphene structure and 2D transport.
- Focus on experimental and theoretical studies of graphene constrictions, quantum dots, and double quantum dots.
- Analysis of current suppression and transport gap phenomena.
Main Results:
- Graphene constrictions below 100 nm exhibit current suppression due to a transport gap.
- The transport gap arises from localized charge puddles within the constriction.
- The size of the transport gap is width-dependent.
- Graphene constrictions can effectively confine charge carriers to form quantum dots.
Conclusions:
- Graphene nanostructures offer tunable electronic properties.
- The observed transport gap in narrow constrictions is a key phenomenon for device applications.
- Graphene quantum dots demonstrate potential for controlling charge carriers and exhibiting Coulomb blockade effects.
